2026 Compare Cities Climate:
Brentwood, CA vs Castro Valley, CA

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Highlights
- Castro Valley has 46.9% more rainy days than Brentwood.
- Castro Valley has 0.4% more Sunny Days than Brentwood.
- On the BestPlaces comfort index, Castro Valley scores 1.2% better than Brentwood
 Brentwood, CACastro Valley, CAUnited States
 Rainfall  Unlock2138
 Snowfall0  Unlock28
 Precipitation  Unlock66106
 Sunny260  Unlock205
 Avg. July High  Unlock7686
 Avg. Jan. Low40  Unlock22
 Comfort Index (higher=better)  Unlock8.67
 UV Index5.4  Unlock4.3
 Elevation  Unlock1612443
Reviews for Brentwood    6 Reviews

Brentwood, 50 miles east of San Francisco, has a great climate. We are in a valley, east of Mount Diablo. We get a few weeks of pretty hot days - 100+, but the rest of  More

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Over 16 years ago

I love living in Brentwood. Our city planners and workers have done an excellent job in creating a beautiful city filled with trees, parks, well- planned communities,  More

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We moved to a new “Active Adults” (over 55) housing development in Brentwood about 6 years ago. The location is great if you like to fish, go pleasure-boating, or water  More

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Reviews for Castro Valley    7 Reviews

CURMUDGEON - THANK YOU for your post. The most important part of your comment is your second paragraph. "Hodge-Podge" is the correct word for a lot of Castro  More

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Over 12 years ago

Kind of rural but close to Oakland and San  More

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Castro Valley is the largest unincorporated "city" in the Bay Area. Over the years, several attempts have been made to incorporate, but they have all been defeated at  More

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